Linear and volumetric shrinkage displacements of resin composite restorations with and without debonding

Siti Mariam Ab Ghani, Mohamed Ibrahim Abu Hassan, Abdul Halim Abdullah, Amir Radzi Ab Ghani, Saiful Islam Izra’ai, Wondwosen Aregawi, Hooi Pin Chew, Alex Fok

Research output: Contribution to journalArticlepeer-review


The study aimed to compare shrinkage displacements of fully and partially bonded resin composite restorations (RCRs). Two groups (n=5) Class-I RCR evaluated: Group 1 (G1) fully bonded and Group 2 (G2) debonded at the floor. Experimental results were compared with predictions from simple theory and finite element analysis (FEA). The experimental linear surface displacement (LSD) was G1 62.5±5.2 µm and G2 32.8±4.0 µm. Theoretically-predicted LSD for G1 60.1±7.4 µm and G2 31.3±7.5 µm. FEA-predicted LSD were G1 65.2 µm and G2 34.6 µm. The experimental volumetric surface displacement (VSD) was G1 1.22±0.2 mm3 and G2 0.63±0.2 mm3. Theoretically-predicted VSD for G1 1.36±0.2 mm3 and G2 0.67±0.2 mm3. No significant difference (p>0.05) was found in LSD and VSD among the experimental, theoretical and FEA in the same group. Significant differences (p<0.05) were noted between the two groups, with LSD and VSD of G2 values being almost half of G1. This pattern gave an insight of a debond restoration characteristics.

Original languageEnglish (US)
Article numberdmj/2023-023
Pages (from-to)659-668
Number of pages10
JournalDental Materials Journal
Issue number5
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023, Japanese Society for Dental Materials and Devices. All rights reserved.


  • Finite element analysis
  • Micro-computed tomography
  • Polymerization shrinkage
  • Restoration debonding

PubMed: MeSH publication types

  • Journal Article


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